linux/drivers/video/fbdev/core/cfbimgblt.c

/*
 *  Generic BitBLT function for frame buffer with packed pixels of any depth.
 *
 *      Copyright (C)  June 1999 James Simmons
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 *
 * NOTES:
 *
 *    This function copys a image from system memory to video memory. The
 *  image can be a bitmap where each 0 represents the background color and
 *  each 1 represents the foreground color. Great for font handling. It can
 *  also be a color image. This is determined by image_depth. The color image
 *  must be laid out exactly in the same format as the framebuffer. Yes I know
 *  their are cards with hardware that coverts images of various depths to the
 *  framebuffer depth. But not every card has this. All images must be rounded
 *  up to the nearest byte. For example a bitmap 12 bits wide must be two
 *  bytes width.
 *
 *  Tony:
 *  Incorporate mask tables similar to fbcon-cfb*.c in 2.4 API.  This speeds
 *  up the code significantly.
 *
 *  Code for depths not multiples of BITS_PER_LONG is still kludgy, which is
 *  still processed a bit at a time.
 *
 *  Also need to add code to deal with cards endians that are different than
 *  the native cpu endians. I also need to deal with MSB position in the word.
 */
#include <linux/module.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <asm/types.h>
#include "fb_draw.h"

#define DEBUG

#ifdef DEBUG
#define DPRINTK(fmt, args...) …
#else
#define DPRINTK …
#endif

static const u32 cfb_tab8_be[] = …;

static const u32 cfb_tab8_le[] = …;

static const u32 cfb_tab16_be[] = …;

static const u32 cfb_tab16_le[] = …;

static const u32 cfb_tab32[] = …;

#define FB_WRITEL …
#define FB_READL …

static inline void color_imageblit(const struct fb_image *image,
				   struct fb_info *p, u8 __iomem *dst1,
				   u32 start_index,
				   u32 pitch_index)
{ … }

static inline void slow_imageblit(const struct fb_image *image, struct fb_info *p,
				  u8 __iomem *dst1, u32 fgcolor,
				  u32 bgcolor,
				  u32 start_index,
				  u32 pitch_index)
{ … }

/*
 * fast_imageblit - optimized monochrome color expansion
 *
 * Only if:  bits_per_pixel == 8, 16, or 32
 *           image->width is divisible by pixel/dword (ppw);
 *           fix->line_legth is divisible by 4;
 *           beginning and end of a scanline is dword aligned
 */
static inline void fast_imageblit(const struct fb_image *image, struct fb_info *p,
				  u8 __iomem *dst1, u32 fgcolor,
				  u32 bgcolor)
{ … }

void cfb_imageblit(struct fb_info *p, const struct fb_image *image)
{ … }

EXPORT_SYMBOL(…);

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;